From: Asai Thambi S P <asamymuthupa@micron.com>
Date: Wed, 30 May 2012 01:44:01 +0000 (-0700)
Subject: mtip32xx: minor performance tweak
X-Git-Tag: v3.5-rc1~26^2~3
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=377b8fc6d70aab90ccfc053630c65835defbc3f8;p=~emulex%2Finfiniband.git

mtip32xx: minor performance tweak

When checking for command completions if the register value is zero, proceed
to next register.

Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index cd271d5e1b7..29735316730 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -970,6 +970,8 @@ static inline void mtip_process_sdbf(struct driver_data *dd)
 	/* walk all bits in all slot groups */
 	for (group = 0; group < dd->slot_groups; group++) {
 		completed = readl(port->completed[group]);
+		if (!completed)
+			continue;
 
 		/* clear completed status register in the hardware.*/
 		writel(completed, port->completed[group]);